package com.study.cloud.controller;

import com.study.cloud.entity.User;
import com.study.cloud.service.AggregationService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.async.DeferredResult;
import rx.Observable;
import rx.Observer;

import java.util.HashMap;
import java.util.Map;

@RestController
public class AggregationController {

    public static final Logger LOGGER = LoggerFactory.getLogger(AggregationController.class);

    @Autowired
    private AggregationService aggregationService;

    @GetMapping("/aggregate/{id}")
    public DeferredResult<HashMap<String, User>> aggregate(@PathVariable Long id) {
        Observable<HashMap<String, User>> result = this.aggregateObservable(id);
        return this.toDeferredResult(result);
    }


    private Observable<HashMap<String, User>> aggregateObservable(Long id) {
        //合并两个或多个Observables发射出的数据项，根据指定的函数变换它们
        return Observable.zip(this.aggregationService.getMovieUserById(id),
                this.aggregationService.getUserById(id),
                (movieUser, user) -> {
                    HashMap<String, User> map = new HashMap<>();
                    map.put("user", user);
                    map.put("movieUser", movieUser);
                    return map;
                });
    }

    private DeferredResult<HashMap<String, User>> toDeferredResult(Observable<HashMap<String, User>> details) {
        DeferredResult<HashMap<String, User>> result = new DeferredResult<>();
        //订阅
        details.subscribe(new Observer<HashMap<String, User>>() {
            @Override
            public void onCompleted() {
                LOGGER.info("完成...");
            }

            @Override
            public void onError(Throwable throwable) {
                LOGGER.error("发生错误...", throwable);
            }

            @Override
            public void onNext(HashMap<String, User> movieDetails) {
                result.setResult(movieDetails);
            }
        });
        return result;
    }
}
